In a conference management system, a user can create one ore many conferences. The user that creates a conference is the conference organizer. But a user can also register in a conference.
So there should be 3 entities: Conference, User, Organizer
Conference: id, name, description
Organizer: id, name, description
User: id, name, username, password, email, etc
Now, do you know how the relationships between this entities should be?
This model seems difficult to understand, because a organizer can organize multiple conferences and a conference is organized by one organizer. So should be a 1 to many relationship between organizer and conference? But then, the organizer is also a user that besides create a conference can also register in conferences. So how should be the relation between the user and the event/organizer?